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The previous observations are correct, the three cables are: 5 volts, ground, Signal. Between ground and signal, there must be voltage variations between approximately 0 and 4 volts, this each time the magnets pass. In amazon they sell some motor, controller and throttle testers, you just have...

The strange thing is that coming out of the box we charge the battery and the assisted pedaling does not work, we also have another one of the same brand and characteristics that when one pedales makes jumps the speed is not constant. In both they do not indicate error codes

Hi, I have a haibike with a Yamaha middrive motor, the panel lights up and the walk operation works, but when I pedal the assistance doesn't work, what could it be? since the ebike is new.